I've seen "card error" on other cameras; and it has several causes:
1) Light corrosion on the card contacts, either on the card &/or in the camera;
2) Improper formatting, i.e. FAT32 when only FAT16 is supported;
3) Counterfeit card that is dodgy at best -- Especially if you bought it on eBay from a "dealer." (Popular Photography or Shutterbug (I forget which) just had an article on just this a month or two ago; and in fact even I have been bit.
)
4) Rarely for xD, but mainly for CF Type 1 and (especially) Type II (MicroDrive): Use of an "OEM" card that is designed for an MP3 player that are crippled, i.e. they don't meet the specs. If you go on to eBay and look up Hitachi MicroDrive, you'll see that almost all of the 4, 5 & 8 gB drives are in OEM packaging: They have been pulled from (especially) Apple iPods, as well as other MP3 players. [Apple started the trend of ordering MD cards that did NOT meet the ATA 1.4 spec, i.e. they were intentionally crippled for use in other devices... Such as cameras.];
5) Cooler temps causing a dip in the battery voltage: When you're "down at cruising level," what is the water temp at depth?
My suggestions for your Olympus C-8080:
A] Go to Staples, Circuit City, or other chain retailer and pick up a new CF card in the manufacturers package. CF is better to use, because it is more rugged than xD, which can flex. DPReview doesn't say whether your camera supports FAT32 (cards over 2047 MB), so for this troubleshooting, don't get a card over 2.0 gB;
B] Make sure you format the card in the camera itself;
C] Get a new battery; as the old one (especially if it's the original, which is over 3 years old) may be getting weak, especially at cooler temps;
D] Put the camera in the UW housing (to protect from condensation during this test) and stick it in the fridge for 30-45 minutes; then pull it out, power it up, and see if the problem replicates.
Hope this generic advice helps!
This is very strange. It happened once in Bonaire about a year ago, then cleared up, now happening again: I'm using a C-8080 with a PT housing and Inon D-2000 strobe. Everything is charged and completely functioning. When I get into the water and down at cruising level, I turn the camera on for a pic, and without pushing any other buttons, the screen stays blank for about 6 seconds, then the AF engages on its own and goes in, then out, in then out, then the screen goes blank again - then I get a blue screen saying "card error". This is a 1/2 gig card that is maybe 6 month old with no photos on it. Once I get to the surface, it seems to work fine, taking regular photos both topside and just below surface level.
I've looked at Oly's site, and I know they have the download to fix AF problems, but I'm running Vista, so that won't help. Anyone have this problem or any recommendations? Thanks in advance!